The walls and gables survive to their full height, which is unusual for a ruin of this age, and the decorative stonework around the doorway and windows is well above the ordinary for a single-cell rural church. The pointed doorway in the south wall retains an ornate external moulding, a putlog-hole for a drawbar, and a hanging eye; an ornate stoup, a small basin for holy water, is carved directly into the interior of the door embrasure. The east window is more elaborate still, comprising two pairs of cusped ogee-headed lights arranged one above the other, set within a splayed embrasure beneath a flat hood moulding. Patches of original plaster survive on both internal and external faces of the walls, and fragments of the removed door-jamb decoration still lie scattered about the graveyard.

Most of the standing fabric dates to around 1500, though scholars Thomas Westropp and Ann Swinfen both noted that earlier masonry is visible in the lower courses of the east and north walls, suggesting a longer history on the site. The name of the founder is unrecorded. The church takes its name from the Irish 'Rath Boirne', a phrase that also names the parish and the nearby river, and it sits just north-north-east of an early ecclesiastical enclosure that is the likely origin of that place-name. A belfry once stood on the west gable; it was mentioned in Ordnance Survey letters of 1839 but has since disappeared entirely, leaving that gable plain and featureless. The surrounding graveyard extends southward into the adjacent enclosure, and thirteen burial markers survive within the church interior itself, including two headstones with walled graves and eleven flat slabs.

The site carries more than the church alone. About thirty metres to the south sits a bullaun stone, a boulder with one or more artificial cup-shaped hollows that are commonly associated with early Christian or pre-Christian ritual use in Ireland. Roughly twenty-five metres to the east-south-east, within the enclosure, there is the entrance to a souterrain, an underground stone-lined passage typical of early medieval settlement sites, often interpreted as a place of storage or refuge. Taken together, the church, the enclosure, the bullaun, and the souterrain make this a quietly layered corner of the Burren's edge, where several centuries of use have settled into the same small field.